Date: Mon, 03 May 1999 14:38:46 -0700 From: Greg Shenaut <greg@bogslab.ucdavis.edu> To: stable@FreeBSD.ORG Subject: Re: Dos2unix Message-ID: <199905032138.OAA23272@deal1.bogs.org> In-Reply-To: Your message of "Mon, 03 May 1999 14:52:25 CDT." <19990503145223.A8709@holly.dyndns.org>
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In message <19990503145223.A8709@holly.dyndns.org>, Chris Costello cleopede:
>On Mon, May 3, 1999, Vince Vielhaber wrote:
>>
>> On 03-May-99 Chris Costello wrote:
>> > On Mon, May 3, 1999, Michael C. Vergallen wrote:
>> >> Here it is ... someone gave me this routine to use ...
>> >
>> > This code is both unnecessarily complex and it does not
>> > function the same way the BSDI dos2bsd/bsd2dos tools work.
If you want to see something which is seriously over-complex
and works almost nothing like the bsdi tools, read on. If
nothing else, it may be good for a laugh. . . .
I used BSD/OS for several years before I came over to FreeBSD, and
I disliked the BSDI utils enough that I wrote the following code
several years ago. Its main advantages are that it can be compiled
to run on *nix or msdos, it can handle *unix <--> msdos <--> mac,
and, while it can be used as a filter, it is designed to convert
multiple files *in place* (i.e., "fixnl *.[ch]" replaces all the
*.[ch] files with versions containing only locally valid end-of-line
characters). This is because 99 times out of 100, this is what
you want to do.
BTW, you have to use the -z flag to cause ^Z to signal EOF; the -Z
flag will add a newline at the end of the file if it doesn't already
end with one--this is handy sometimes; the -F flag is like the -Z
flag, except that it won't add a newline if the file ends in \f (I
don't remember why I needed this--if you don't like this option,
don't use it).
-Greg Shenaut
(tabs set to 4 columns)
-----------------
/*
* take care of \r\n stuff in a sightly more intelligent way
* we are concerned with both \n\r and \r\n
* \n\r --> NL (nonstandard, but handled)
* \r\n --> NL (DOS)
* x\n --> xNL (UNIX)
* \nx --> NLx (UNIX)
* x\r --> xNL (MAC)
* \rx --> NLx (MAC)
* xEOF --> xNL (x is not \f--all)
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
char Usage[] = "[ -n|-rn|-r|-z|-Z|-F ][ file ...]";
/* OS defaults */
char *nl = 0;
#ifdef __MSDOS__
#define NL "\r\n" /* DOS */
#else dos
#ifdef __MAC__ /* not sure this is the right constant. . . . */
#define NL "\r" /* Macintosh (anything to be different) */
#else mac
#define NL "\n" /* UNIX newline */
#endif mac
#endif dos
FILE *
efopen(char *s, char *m) {
FILE *f = fopen(s, m);
if (f == NULL) {
fprintf(stderr, "Failed to open %s, mode %s\n", s, m);
exit (1);
}
return(f);
}
void
usage(char *s) {
fprintf(stderr, "Usage: fixnl %s\n", s);
exit(1);
}
char tmp[50];
void
main(int argc, char **argv) {
int i, c, lastc;
int zflg = 0;
int Zflg = 0;
int Fflg = 0;
FILE *in, *out, *efopen();
while (argc > 1 && *argv[1] == '-') {
char *p;
for (p = argv[1]+1; *p; p++) switch (*p) {
default:
usage(Usage);
case 'z':
zflg = 1;
break;
case 'F':
Fflg = 1;
/* fall thru */
case 'Z':
Zflg = 1;
break;
case 'n':
if (nl) usage(Usage);
if (p[1] == 'r')
usage(Usage);
nl = "\n";
break;
case 'r':
if (nl) usage(Usage);
if (p[1] == 'n') {
nl = "\r\n";
p++;
} else
nl = "\r";
}
argc--; argv++;
}
if (!nl) nl = NL;
sprintf(tmp, "/tmp/fnl%04x.tmp", (short)getpid());
if (argc <= 1) {
in = stdin;
out = stdout;
i = 0;
goto cheat;
}
for (i = 1; i < argc; i++) {
struct stat s;
if (stat(argv[i], &s)
|| (s.st_mode & S_IFMT) != S_IFREG) {
fprintf(stderr, "%s is not a regular file -- skipped\n", argv[i]);
continue;
}
out = efopen(tmp, "w+");
in = fopen(argv[i], "r+");
if (!in) {
fprintf(stderr, "Failed to open %s -- skipped\n", argv[i]);
continue;
}
cheat:
lastc = EOF;
while ((c = getc(in)) != EOF) {
if (zflg != 0 && c == 032) { c = EOF; break; } /* handle ^Z as early EOF */
switch (c) {
default:
switch(lastc) {
default:
if (lastc != EOF)
putc(lastc, out);
break;
case '\r':
case '\n':
fputs(nl, out);
break;
}
break;
case '\r':
switch(lastc) {
default:
if (lastc != EOF)
putc(lastc, out);
break;
case '\r': /* two in a row */
fputs(nl, out);
break;
case '\n':
fputs(nl, out);
c = EOF;
break;
}
break;
case '\n':
switch(lastc) {
default:
if (lastc != EOF)
putc(lastc, out);
break;
case '\n': /* two in a row */
fputs(nl, out);
break;
case '\r':
fputs(nl, out);
c = EOF;
break;
}
break;
}
lastc = c;
}
switch(lastc) {
default:
putc(lastc, out);
if (!Zflg && !Fflg) break;
case '\n':
case '\r':
fputs(nl, out);
case EOF:
break;
case '\f':
putc(lastc, out);
if (!Fflg && Zflg)
fputs(nl, out);
break;
}
if (in == stdin) break;
/* now copy on top of the original file & unlink the tmp */
/* ... I hope this won't leave smegma behind at the end ... */
rewind(in);
rewind(out);
while ((c = getc(out)) != EOF)
putc(c, in);
fflush(in);
write(fileno(in), NULL, 0); /* works in DOS, no effect in unix */
#ifdef __unix__
ftruncate(fileno(in), ftell(in));
#endif
fclose(in);
fclose(out);
unlink(tmp);
}
exit(0);
}
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